# Define your item pipelines here
#
# Don't forget to add your pipeline to the ITEM_PIPELINES setting
# See: https://docs.scrapy.org/en/latest/topics/item-pipeline.html


# useful for handling different item types with a single interface
from itemadapter import ItemAdapter
import json
from scrapy.exporters import JsonItemExporter, JsonLinesItemExporter

# class QsbkPipeline:
#     def __init__(self):
#         self.fp = open('duanzi.json','wb')
#         self.exporter = JsonLinesItemExporter(self.fp, ensure_ascii=False,encoding='utf-8')
#     def open_spider(self, spider):
#         print('爬虫开始')

#     def process_item(self, item, spider):
#         self.exporter.export_item(item)
#         return item
    
#     def close_spider(self, spider):
#         self.fp.close()
#         print('爬虫结束')

# class QsbkPipeline:
#     def __init__(self):
#         self.fp = open('duanzi.json','w',encoding='utf-8')

#     def open_spider(self, spider):
#         print('爬虫开始')

#     def process_item(self, item, spider):
#         item_json = json.dumps(item,ensure_ascii=False)
#         self.fp.write(item_json)
#         return item
    
#     def close_spider(self, spider):
#         self.fp.close()
#         print('爬虫结束')


class QsbkPipeline:
    def __init__(self):
        self.fp = open('duanzi.json','wb')
        self.exporter = JsonItemExporter(self.fp, ensure_ascii=False,encoding='utf-8')
        self.exporter.start_exporting()
    def open_spider(self, spider):
        print('爬虫开始')

    def process_item(self, item, spider):
        self.exporter.export_item(item)
        return item
    
    def close_spider(self, spider):
        self.exporter.finish_exporting()
        self.fp.close()
        print('爬虫结束')
